Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5997c4d7edf271…

MALICIOUS

PDF

62.3 KB Created: 2020-12-22 03:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 090052dae12afff93fca98339743d95a SHA-1: 5c5ae72a0449d595b742cb04ae57b9905cc38ffa SHA-256: 8c5997c4d7edf271ff8e1c8a73192041c2b4ff06d6fccafa3eef79cf842dd81b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating the presence of an external URI and a visual download lure. The embedded URL, 'https://traffset.ru/123?utm_term=yariv+photonics+pdf+free+download', suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the nature of the URL point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/123?utm_term=yariv+photonics+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fa2db1358f81.pdf
    • https://cdn-cms.f-static.net/uploads/4392439/normal_5fad4e5a6e065.pdf
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fad3b58b5787.pdf
    • https://cdn-cms.f-static.net/uploads/4478387/normal_5fb287149f1b0.pdf
    • https://cdn-cms.f-static.net/uploads/4411921/normal_5f979d154b5b9.pdf
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5fad511ccf3a3.pdf
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5f8a4498eba8f.pdf
    • https://cdn-cms.f-static.net/uploads/4401691/normal_5fa1b6f6886c1.pdf
    • https://static.s123-cdn-static.com/uploads/4378410/normal_5fc42b8e8e6c1.pdf
    • https://static.s123-cdn-static.com/uploads/4415065/normal_5fdebb2fc961a.pdf
    • https://cdn-cms.f-static.net/uploads/4468294/normal_5fae151cb1ba2.pdf
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5f8aadaf2ffed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e0febe9b6939510aa6a3/t/5fc252723c02f22b9d58877b/1606570610827/fesureg.pdf
    • https://uploads.strikinglycdn.com/files/10fadc46-8df6-4d68-a745-5351aeff6932/kanigazenapusaxunutefuriw.pdf
    • https://static1.squarespace.com/static/5fe12027a185d20763ec87a9/t/5fe12ce6cc5fc45944a1ea21/1608592614361/adobe_illustrator_cs6_tinhte.pdf
    • https://uploads.strikinglycdn.com/files/91455cf0-c836-45d6-b926-3d948ccc8978/mechanics_of_materials_7th_edition_p.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b799.bin
57e3764ef94679bc91fef050f7bf725a2fcb4d032dde9cffcc9fea8c4718d815		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB799 5356 bytes
font_01_sfnt_off0000c9e4.bin
c96485d69532b3e29224515d4bb0096f02b340d96b2d3448f767d0ef0ac40cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E4 9928 bytes

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